Are you looking for something other than the obvious "use a case or put it in a sleeve?"
–
bmike♦Mar 8 '12 at 16:34

Yes I am. If you have the keys in your pocket or lose change, they tend to scratch the lens face even if you have put it in case - I don't know of a case that covers the face of the lens.
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Raj MoreMar 8 '12 at 18:23

Maybe consider not putting the phone in the same pocket as change and keys. ;)
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RichardMar 8 '12 at 20:54